mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-11 23:33:26 +09:00
148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
/* GRLIB APBUART Serial controller driver
|
|
*
|
|
* (C) Copyright 2008, 2015
|
|
* Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <serial.h>
|
|
#include <watchdog.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
static unsigned leon2_serial_calc_scaler(unsigned freq, unsigned baud)
|
|
{
|
|
return (((freq*10) / (baud*8)) - 5) / 10;
|
|
}
|
|
|
|
static int leon2_serial_init(void)
|
|
{
|
|
LEON2_regs *leon2 = (LEON2_regs *)LEON2_PREGS;
|
|
LEON2_Uart_regs *regs;
|
|
unsigned int tmp;
|
|
|
|
#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1
|
|
regs = (LEON2_Uart_regs *)&leon2->UART_Channel_1;
|
|
#else
|
|
regs = (LEON2_Uart_regs *)&leon2->UART_Channel_2;
|
|
#endif
|
|
|
|
/* Set scaler / baud rate */
|
|
tmp = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, CONFIG_BAUDRATE);
|
|
writel(tmp, ®s->UART_Scaler);
|
|
|
|
/* Let bit 11 be unchanged (debug bit for GRMON) */
|
|
tmp = readl(®s->UART_Control) & LEON2_UART_CTRL_DBG;
|
|
tmp |= (LEON2_UART1_LOOPBACK_ENABLE << 7);
|
|
tmp |= (LEON2_UART1_FLOWCTRL_ENABLE << 6);
|
|
tmp |= (LEON2_UART1_PARITY_ENABLE << 5);
|
|
tmp |= (LEON2_UART1_ODDPAR_ENABLE << 4);
|
|
/* Receiver & transmitter enable */
|
|
tmp |= (LEON2_UART_CTRL_RE | LEON2_UART_CTRL_TE);
|
|
writel(tmp, ®s->UART_Control);
|
|
|
|
gd->arch.uart = regs;
|
|
return 0;
|
|
}
|
|
|
|
static inline LEON2_Uart_regs *leon2_get_uart_regs(void)
|
|
{
|
|
LEON2_Uart_regs *uart = gd->arch.uart;
|
|
|
|
return uart;
|
|
}
|
|
|
|
static void leon2_serial_putc_raw(const char c)
|
|
{
|
|
LEON2_Uart_regs *uart = leon2_get_uart_regs();
|
|
|
|
if (!uart)
|
|
return;
|
|
|
|
/* Wait for last character to go. */
|
|
while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_THE))
|
|
WATCHDOG_RESET();
|
|
|
|
/* Send data */
|
|
writel(c, &uart->UART_Channel);
|
|
|
|
#ifdef LEON_DEBUG
|
|
/* Wait for data to be sent */
|
|
while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_TSE))
|
|
WATCHDOG_RESET();
|
|
#endif
|
|
}
|
|
|
|
static void leon2_serial_putc(const char c)
|
|
{
|
|
if (c == '\n')
|
|
leon2_serial_putc_raw('\r');
|
|
|
|
leon2_serial_putc_raw(c);
|
|
}
|
|
|
|
static int leon2_serial_getc(void)
|
|
{
|
|
LEON2_Uart_regs *uart = leon2_get_uart_regs();
|
|
|
|
if (!uart)
|
|
return 0;
|
|
|
|
/* Wait for a character to arrive. */
|
|
while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_DR))
|
|
WATCHDOG_RESET();
|
|
|
|
/* Read character data */
|
|
return readl(&uart->UART_Channel);
|
|
}
|
|
|
|
static int leon2_serial_tstc(void)
|
|
{
|
|
LEON2_Uart_regs *uart = leon2_get_uart_regs();
|
|
|
|
if (!uart)
|
|
return 0;
|
|
|
|
return readl(&uart->UART_Status) & LEON2_UART_STAT_DR;
|
|
}
|
|
|
|
static void leon2_serial_setbrg(void)
|
|
{
|
|
LEON2_Uart_regs *uart = leon2_get_uart_regs();
|
|
unsigned int scaler;
|
|
|
|
if (!uart)
|
|
return;
|
|
|
|
if (!gd->baudrate)
|
|
gd->baudrate = CONFIG_BAUDRATE;
|
|
|
|
scaler = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, gd->baudrate);
|
|
|
|
writel(scaler, &uart->UART_Scaler);
|
|
}
|
|
|
|
static struct serial_device leon2_serial_drv = {
|
|
.name = "leon2_serial",
|
|
.start = leon2_serial_init,
|
|
.stop = NULL,
|
|
.setbrg = leon2_serial_setbrg,
|
|
.putc = leon2_serial_putc,
|
|
.puts = default_serial_puts,
|
|
.getc = leon2_serial_getc,
|
|
.tstc = leon2_serial_tstc,
|
|
};
|
|
|
|
void leon2_serial_initialize(void)
|
|
{
|
|
serial_register(&leon2_serial_drv);
|
|
}
|
|
|
|
__weak struct serial_device *default_serial_console(void)
|
|
{
|
|
return &leon2_serial_drv;
|
|
}
|